J-Lo comes third in a gruelling triathlon

Superstar actress and singer Jennifer Lopez proved she is the fittest celeb in Hollywood when she finished third in the Nautica Malibu Triathlon in California. It was the first triathlon for the 39-year-old mum, who completed the race in an impressive time of two hours, 23 minutes and 28 seconds.

Jennifer's husband Marc Anthony (39) and personal trainer Gunnar Peterson were there to support her, and her months of tough training paid off as she grabbed third place. It was the perfect way for J-Lo to lose the baby weight after giving birth to twins Max and Emme in February - and the diva is certainly back in top form.

Other famous faces who lined up at the triathlon start line included sexy tennis star Anna Kournikova (27) and actor Matthew McConaughey(38). All the stars were competing for a good cause, of course: Jennifer Lopez gave her prize winnings to a children"s hospital in Los Angeles.